Improvement in machines for grinding and polishing tools



Unire STATES JAMES A. HENDRIOK, OF PROVIDENCE, PENNSYLVANIA.

IMPROVEMENT IN MACHINES FOR GRINDING AND POLISHING TOOLS.

Specification forming part of Letters Patent No. @(LSS. dated December 8, 1863; antcdatcd November 21, 1863.

To all whom it may concern:

Be it known that I, J Aims A. HENDRICK, of Providence, in the county of Luzerne and State of Pennsylvania, have invented a new and Improved Machine for Grinding` and Bolishing Metal Tools, Cutlery, and other Articles; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, makinga part of this specification, in which- Figure l is a plan or top view of my invention; Fig. 2, a side sectional view of the same, taken in the line a: x, Fig. l.

Similar letters of reference indicate correspending parts in the two figures.

The object of this invention is to obtain a machine of simple construction, whereby tools-such, forinstance, as axes, knives, and like articles-and also other articles which require grinding and polishing, may be operated upon with that view in the most efficient manner, and perform the work automatically in such amanner as to preserve perfectly the exact form the tool or other article operated upon is designed to have.

To this end the invention consists in the employment or use of a pattern attached to a rock-shaft which is connected by a pitman with another rock-shaft having the tool or other article fitted to it, said rock-shafts being placed on a suitable sliding frame which works on a frame on which the grindstone is hung, and on which frame an adjustable bearing is placed for the pattern to work against, all being arranged as hereinafter set forth.

To enable those skilled in the art tofully understand and construct my invention, I will proceed to describe it.

A represents a rectangular horizontal frame, which is supported at a suitable height by legs, a, and has a grindstone, B, placed or suspended upon it by a shaft, C.

D is a shaft which has its bearings attached to the under side of the frame A. This shaft D is parallel with the grindstone-shaft O and has upon it a drum, E, around which and a pulley, F, on the grindstone-shaft C a belt, G, passes.

On the frame A there are placed two inclined bars, c c, one at each side of the frame A, and on each bar c there is a way, d. The

outer ends of the bars c c are connected by a curved cross-bar, c, and by a cross-bar, f, near their centers.

H is a frame which is fitted and works on the ways d (l. This frame H is provided with posts g at cach side, in the upper parts of which are the bearings of two rock-shafts, I J, one rock-shaft, I, being at the inner end of frame H, and the other, J, at the outer end of the frame, as shown in both gures. On one end of the rock-shaft there is secured a crank, K, which is connected by a pitman, L, with a crank-pulley, 7c, at one end of the shaft D. By this mechanism a working motion is communicated to the shaft I from the shaft D.

To the shaft I there is attached an arm, M, which has two pawls, ij, connected to it. One of these pawls, ,is a pulling one,and the other, j, a pushing one, and they engage with ratchets 7c lcon a screw, N, which works in a nutin a post, Z, on the frame H. The outer end of the screw N has its bearing in a bar, O, which is tted loosely on both rock-shafts I J, the end of the bar O which is on the shaft J being between hubs 'm m on said shaft, and the opposite end being between a hub, a, on the shaft I and the arm M. The bar O is connected to a bar, P, the lower end of which is fitted loosely on the shaft D.

On the shaft J there is secured a socket, Q, in which a pattern, B, is secured, said pattern being precisely like the tool or other article to be ground or polished. This pattern Works against a bearing, S, which is of convex form at its face side, and is attached to a post, 0, on a slide, T, the llatter being fitted between guides p p on the frame H, and operated or adj usted by a set-screw, q.

The tool or other article, U, to be operated upon is fitted in a socket, V, on the shaft I, and the two shafts I J are connected by a pitman, NV, the ends of which are attached to arms r1 on the sockets QV.

The operation is as follows: The grindstone shaft C is rotated by any convenient power, and motion is communicated to the rock-shaft I by the mechanism previously described, and motion is communicated to the rock-shaft J from I by the pitinan W. The tool U is in contact with the stone B, and is made to work against it by the motion of the shaft I, the pattern E Working against the bearing S and regu-t lating or operating the frame H, so that the tool will be properly presented to the stone at all points and made to bear against the stone in such a manner as to preserve its desired shape or form. The frame H, in consequence of being placed on inclined ways, has a tendency to keep the tool in contact with the stone by gravity only. As the tool and pattern are thus operated, the frame H has a short lateral reciprocating movement given it by the pawls i j, screw N, and the nut inthe post Z, and the toolU is drawn laterally across the face of the stone, so as to be acted upon its entire width.

This invention has been practically tested,

and it performs its work in a thorough and ef cent manner.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The two rock-shafts I J, tted in a sliding frame, H, havingalateral reciprocating movement, and provided, respectively, with the sockets Q V, with the tooland pattern tted in them and operated from the grindstoneshaft C, as shown, or in any equivalent Way, in combination with the grindstone B, and the adjustable bearing S, or its equivalent, for the purpose herein set forth.

JAMES A. HENDRICK.

Witnesses:

WiLLIAM LANE, E. M. D. LANE. 

